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Extending the range on your open sight muzzleloader

Extending the range on an open sight muzzleloader

All photo credits: Brandon Evans

There are no questions about it: muzzleloaders are fun to shoot. There is just something about pouring black powder down the barrel, pushing a slug in, adding a cap and trying to look through all the smoke after the shot.

But hunting with a muzzleloader, well, that’s even better. For most states, muzzleloader season falls earlier in the year, which typically means more mild weather. You get to hunt bucks or bulls that haven’t seen a ton of pressure and, for the most part, tags are a little easier to draw.

So what’s the downside to muzzleloaders? Well, they aren’t known to be the most consistent or accurate firearms out there; however, there are a few things you can do to make them a bit more accurate. I wrote an article a few years back about one of the best modifications I think you can do to help with accuracy if you want to or are required to run an open sight. You can check out that article here. In that article, I explain the steps to adding a front globe sight and a rear peep sight. In this article, we’re going to be building on that same idea, but, instead, replacing the rear peep with an adjustable one.

After I wrote the first article, there were some questions that came up after people started trying the process on many different types of rifles. The main one was that people need to shim the rear peep to get enough elevation adjustment. When you add the components together for the front glode, it gets pretty high off the barrel. I ended up using a few different things to build shims. You can use thin plastic cutting boards, different thickness of sheet metal or the best and easiest thing I’ve found is a pipe.

Creating shims for muzzleloader sight adjustment

To make the shim out of a pipe, simply start with a piece that has the same contour as the barrel, trace and make the mounting holes.

Muzzleloader sight shim cut out of pipe

Drill the holes first. Then, cut it out, file it smooth and polish it and you have a simple and strong spacer.

Finished shims for muzzleloader sight adjustment

I built one for this new setup as I wanted to get the maximum elevation adjustment I could for the system.

Taking the open sight muzzleloader even further

You're probably wondering how we are extending our range by just adding a different rear sight. Like I mentioned in the first article, I come from the bowhunting world and the big thing there are slider sights. Being able to move your sights up or down to allow you to shoot some pretty far distances is key for practice and building confidence to make those closer shots that much easier. We can apply the same concept to muzzleloaders. The higher you raise the rear sight, the higher the point of impact, which compensates for bullet drop. It’s the same thing as an adjustable turret on a scope.

Now for the disclaimer: In no way am I suggesting that you make these modifications so you can go shoot animals at crazy distances. Know your limits and be ethical. However, it’s a great time to go ring steel at yardage with a muzzleloader while people shooting scoped centerfire rifles watch in disbelief.

For the parts, I’m using a Williams FP style rear peep. You can get them from various gun manufacturers at, or Just make sure that you get the right one that fits your gun.

Accessories for building an adjustable sight muzzleloader

Elevation knobs.

I’m also installing an elevation target knob and an elevation lock knob. Some sights will come with these installed already. These will allow me to make elevation adjustments without any tools.

I also had to get a little longer mounting screws because of the spacer or shim that I made. I’m lucky and have a store here in my hometown that has bulk gun screws in stock.

Gear Shop - Shop Now

Step 1

Removing screw for elevation knob on muzzleloader

Williams FP style rear peep sight before adjustment knob was added.

The first step after building the shims mentioned above is installing the elevation lock and adjusting knob.

Installed elevation knob for muzzleloader

It’s pretty simple: just remove the screws with a screwdriver and replace it with the new ones.

Finished installing elevation lock and adjustment knob

Finished installing the elevation lock and adjustment knob.

Step 2

Removing old muzzleloader rear peep sight

Now you will want to remove the old rear sight.

Step 3

Attaching williams adjustable muzzleloader sight peep

Next, install the new Williams FP style rear peep sight.

Adding Loctite to sight screws

I add a little Loctite to the mounting screws just for added security. These are small screws so make sure that you don’t over tighten and strip them out; it’s not like these are holding the whole gun together.

Step 4

Adjustable muzzleloader rear sight without yardage marks

I added a piece of waterproof paper to the side of the sight. I used archery sight tape material that I had laying around. This is used to mark the different yardages that you’ll sight it in for.

Finished adjustable muzzleloader rear sight peep

Here is the finished adjustable muzzleloader rear sight peep with yardage marks.

Step 5

Range time! Get it sighted in. I used a ballistics calculator to show me how many inches high it would hit at 100 yards if I was zeroed at the longer distance. I then verified those and make adjustments if needed.

Step 6

The final step that I did once I had all the final marks was place a piece of thick clear packing tape over the paper. I thought this might protect it just in case it gets a little wet.

There you have it—a slider sight for a muzzleloader. This was a fun modification that allowed me to push the muzzleloader a little bit. Muzzleloaders are fun and there are a lot of variables that go into making them consistent and accurate. I hope you enjoyed the article. If you have any comments, tips or advice leave them in the comments below. Good luck in your muzzleloading adventures!

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Brandon E.
Brandon E. - posted 7 months ago on 10-22-2019 10:24:51 am
goHUNT Team

Hey Douglas,

Thanks! The spacer that I ended up using was about 1/8 inch thick.

Douglas B. - posted 7 months ago on 10-22-2019 09:28:44 am

Hey Brandon, I want to say that a great step by step how to but I was wondering what thickness of spacer did you use under the rear peep?

Brandon E.
Brandon E. - posted 8 months ago on 09-11-2019 08:42:27 am
goHUNT Team

Hey Derek, without the gun in front of me it's hard to say. A lot of the "gunsmithing" screws are #6-48, #8-40 or #8-48.

Derek S. - posted 9 months ago on 08-27-2019 08:07:53 pm

Brandon, I tried to install the rear peep closer to the breech and the screw doesn’t fit. Do you know what screw size/type that I need to use in order to install it on the rear threaded hole of the scope mounts?

Brandon E.
Brandon E. - posted 11 months ago on 06-04-2019 01:46:26 pm
goHUNT Team

Thanks, Patrick B. Here are the Williams part numbers that I used.
Sight #70938
Lock Knob #61613
Elevation Knob #11524
Hope this helps, best of luck!

Patrick B. - posted 11 months ago on 06-04-2019 10:05:45 am

Brandon E. Thanks for the great post with pics. I was hoping you could provide the part numbers for the FP site as well as the elevation lock and adjusting knob? Thanks!

Brandon E.
Brandon E. - posted 1 year ago on 05-03-2019 02:05:41 pm
goHUNT Team

@ Aaron, I did not have to cut down the lock screw at all.

Aaron D. - posted 1 year ago on 05-02-2019 10:43:53 pm

I have the same sight for my Knight Bighorn and was curious if you had to cut down the elevation lock screw? The screw is to long for my gun and was just curious if you did cut yours down, how much did you have to take off?

Jake S. - posted 1 year ago on 04-25-2019 03:47:38 pm

Ryan h. were you able to get the a-bolt model to fit on the CVA?

ryan h. - posted 1 year ago on 10-21-2018 08:04:24 pm

If I’m looking at this right the hole spacing is .86 on cva. Browning a-bolt spacing is also .86. Williams sells a fp a-bolt model. I’ll prob call to confirm the hole spacing but it might work.

Nathan F. - posted 1 year ago on 08-16-2018 08:44:17 am
Midland, TX

I've got a peep and globe on my Traditions Vortek, but I like the idea of this. I might have to look into the spacer idea as well. Otherwise taking it to a gunsmith and having them tap the correct hole spacing into the Traditions' barrel to receive the FP sight.

Brandon E.
Brandon E. - posted 1 year ago on 08-15-2018 09:50:07 am
goHUNT Team

@ Ryan M.

No, I haven't yet. I don't think that they make one for the CVA's. What I'm thinking of trying when I get a chance is tapping thread's into the spacer and screwing the spacer to the barrel, then the sight to the spacer. Just not sure how I feel about that many connections, but I want to try it and see what it's like. I'll keep you posted after I get a chance to tinker a little.

Ryan M. - posted 1 year ago on 08-14-2018 09:05:40 pm
Colorado Springs, CO

Brandon, were you able to do this modification with your CVA muzzleloader? I don't see an FP style sight available from Williams and I wonder if another one might fit.