Welcome to the forum, Dominik.

Yes, 50 fps is to much. You didn't give us the load or bullet weight you are shooting. Is it black powder or smokeless? If smokeless, what powder are you using? Some powders burn better than others, at our lower pressures. BP, depending on the brand, will burn a bit different and will also foul the bore differently.

Please give us the powder, weight and velocity, also the bullet weight and whether your shooting breech seated or fixed ammunition.

Not many people shoot your caliber so, much of what we say, especially about smokeless loads, will have to be speculation but, I do have a rifle that should be close. It's a 35 caliber on the 357 Maximum case but, I have only shot it breech seated, with smokeless.

Frank

One thing that I forgot to ask is, are your groups stringing mostly vertical or are they horizontal or both? 

Frank

Yes, sorry, sure, should have provided more details. I shoot Black Powder Only. I was trying from 26 to 32 grs in 1,5Fg and 2Fg. I always pour the powder using 24 inch drop tube. 

Barrel has 1:28 twist. I shoot 200 grs nose bore riding design (Accurate Moulds) Band .001 larger than the bore (slugs at .369). Bullets are made from 8BHN alloy. 

Bullets are not sized, pan lubed with SPG. 

I clean after each shot, Felt cleaner with cleaning compound and then dry patch. Problems are still there. 

Velocities that I am noting are between 1100 Fps (26grs CH4) to 1300 (32 grs CH2). I get the same kind of spread in all loads that I test. 

The Spread has a tendency increase if I compress. 

I tried both: 
- fixed ammo with fire formed cases neck sized so that cases can hold the bullet and then bullet hand loaded into the case. Necks sized so that there is a sure hold for the bullet, but no crimping. If I do not size the necks, inner diameter is 8 thousands of an inch larger than the bullet. Simply original cases had thicker walls than 38-55 cases that I shortened and adopted to this obsolete caliber.
- Breech seating 1/8 inch ahead of case, case full of powder. Also different granulations. On 37 grs of FFFg gives max velocities of 1350 Average Fps. the same kind of spread unfortunately. 

That would suggest ignition issues? I started thinking that 26 inch barrel is maybe too short to burn that kind of powder amounts? 

I also do have an observation, that compression increases spread - that would probably point over to ignition issues..

My Maynard is a percussion breach loader, so I ignite the powder with a 6mm RWS Musket cap...

Schuetzendave, are you putting the Wad from the primer side or from the powder side?

gunlaker wrote on Oct 14^th, 2018 at 10:24am:



I use Pro Chrono Digital

In Schuetzen Rifles Book of Ned Roberts i have read that they used a sort of priming smokeless powder charge to help ignition. Wondering whether that smokeless could be replaced with c.a. 3 grs of 4Fg.. did anyone tried that kind of priming charge on the bottom of the case?

I personally have found over the past seventeen years of competition and load development that the lower SD's and ES's don't always provide the best results and often times they can provide just the opposite. I have learned to go by what my targets / group sizes are telling me is the very best and no longer pay attention to the SD's and ES's they are what they are when all is said and done and they can either be on the high side or the low and they don't seem to make any difference in regards to what actually ends up shooting the very best. 

JLouis

If your load shoots like crap and has large ES, you work on your load.

If your load chrono's well with small ES and the targets are crap, you work on your rifle.

It's just a tool that can help you if, you lesson to it. It's not necessary if you can start with a proven load but, can really help if that isn't available. 

Frank