BAD groups----need help

[One Shot]

I tried without the can. Still using 9.2 of H110 and one box with .220 gr RN, and one with 200 gr Spitzer. I still got one with 4 inch groups ond one with 8 inch groups. I had just fininhed shooting 1/2 in groups with my .223, so I don't think it's me.
Any other suggestions? I did buy some different power, but I wouldn't think it would make that much difference. I have a new Nikon Buckmaster on the gun and would think that shouldn't be the problem.
Thanks again for the help.
Doc

[Rikky Lee]

Hmmm

Time to try a few different things. Both with and without the can on.

Can you get any factory ammunition?

Also try some supersonic loads if you can - and get some 220 and 240 Matchkings.

Finally, just to confirm, you have checked the barrel twist is 1/8?

[BWE Firearms]

Try some 150-180 grain bullets and see how it shoots with and without the suppressor.

[Titleiiredneck]

Confirm its a 1-8 twist, and who made the barrel? Confirm by running a patch through the bore, mark where the rod is when you start and where it is when it makes 1 rotation, measure betwen the marks on your rod and thats the twist. check the muzzle for burrs, and whats the barrel oal and thread pitch on the muzzle?

[Rancid Coolaid]

I've had significant vertical stringing with loads using H110. I have moved to #9 and lil gun and seen marked improvement.

Try something other than H110, it seems to be sensitive to temperature and position in the case.

[Rikky Lee]

You say you are using 190 grain SMK - I'd suggest this is part of the problem.

Recommend you get a pack of 220 SMK and 240 SMK and try the same load development.

There should be a difference.

[FordPrefect]

Got into the whisper a few months ago. Had horrible issues with deviation and H110 powder. Consistent fast first round and a little better for the rest of the string. But still not very good. Hand loads using a scientific scale but still 30-50 foot deviation creating terrible vertical stringing. Switched to lilgun per this forum and now can get with careful measurements 3-5 shot groups with 3-5 fps deviation. Vertical stringing gone. Using 240 SMK though. Would like to also try VV N110 as I hear that is consistent.

Watch the chrono. If the shots are not extremely consistent they will not group well. Especially with heavy subs. This is just my experience so far.

[martineta]

I use H110 for both 125 and 150 grain Nosler Ballitic tips at supersonic velocities. So far every deer I have pointed at died and shooting paper tiny groups with no verticle stringing at all. I shoot a 26 inch Encore stainless with Thompsons´s 1 in 12 twist. I shoot paper when its summer time and shoot deer in 0-60 F degrees. Haven´t noticed any changes that I can see. You shoot em the chest and they fall down. Is the verticle stringing with H110 a subsonic thing because I sure haven´t noticed it shooting supersonic with a long barrel?

I did buy a can of vv110 and a box of 220 matchkings to load subs. My new SSK Encore barrel came to the house the other day. Looking forward to seeing what I can do with the big bullets quietly. I will apply for the suppressor stuff and put a can on after this hunting season.

[Scalce]

Originally Posted by martineta

I use H110 for both 125 and 150 grain Nosler Ballitic tips at supersonic velocities. So far every deer I have pointed at died and shooting paper tiny groups with no verticle stringing at all. I shoot a 26 inch Encore stainless with Thompsons´s 1 in 12 twist. I shoot paper when its summer time and shoot deer in 0-60 F degrees. Haven´t noticed any changes that I can see. You shoot em the chest and they fall down. Is the verticle stringing with H110 a subsonic thing because I sure haven´t noticed it shooting supersonic with a long barrel?

I did buy a can of vv110 and a box of 220 matchkings to load subs. My new SSK Encore barrel came to the house the other day. Looking forward to seeing what I can do with the big bullets quietly. I will apply for the suppressor stuff and put a can on after this hunting season.

H110 strings mostly in subsonic loads.

I am about to give up using it for SS loads and it will be strictly for supersonic ones.