My mystery cartridge

[Mike3888]

Pretty nice Buff, thanks for sharing your new build.

 

[j_h_smith]

Not bad for a new/not broken in barrel, not bad at all. What glass were you using?

 

[BUFF7MM]

Not bad for a new/not broken in barrel, not bad at all. What glass were you using?

Don't laugh, I had a Simmons 3-9X50 8-point here collecting dust, so the Sharps now wears it.
4570 and I are planning a day during the week this week or next to do some chrono work so I'll post follow up data after that.

 

[Uncle Duke]

Range trip today and the 25-45 did not let me down, I've got some more tweaking to do with loads. Tested for grouping today, but didn't get to run any through the labradar. Loads were from 26.5-27.7 with .3 separation between loads H335 was the tested powder, Hornady 87 grain SP pills. 27.1 was the best of the bunch with 26.8 running not far behind. I'm going to run again from 28.9-27.3 with .1 separation and see where I land at.
I didn't get a picture of all the targets but I did get the 27.1 load, 100 yards for range, I don't think it did to bad for a brand new build. I always seem to get 1 flier in 5 shot groups.

Looks like you had a fun Sunday with that new build.

Nice shooting!

 

[BUFF7MM]

Looks like you had a fun Sunday with that new build.

Nice shooting!

CombatAK needs to post up his groups with his 204 Ruger and his hand loads, damn near makes my group look like it covers a square foot.

 

[j_h_smith]

Don't laugh, I had a Simmons 3-9X50 8-point here collecting dust, so the Sharps now wears it.
4570 and I are planning a day during the week this week or next to do some chrono work so I'll post follow up data after that.

That's even more impressive. New barrel, new action, cheap glass, still shooting nice groups. Get rid of that flier and you can't complain.

 

[BUFF7MM]

That's even more impressive. New barrel, new action, cheap glass, still shooting nice groups. Get rid of that flier and you can't complain.

The fliers keep me humble. Always give me something to shoot for.

 

[Uncle Duke]

CombatAK needs to post up his groups with his 204 Ruger and his hand loads, damn near makes my group look like it covers a square foot.

You got what, 50 rounds through that tube?

Looks to me like a future deer will be....shall we say....somewhat less than pleased.

 

[j_h_smith]

The fliers keep me humble. Always give me something to shoot for.

Where are the fliers coming from? First shot, last shot? Any reason for them or are they just happening? I would be very frustrated with such a group and then have that one flier.

 

[BUFF7MM]

You got what, 50 rounds through that tube?

Looks to me like a future deer will be....shall we say....somewhat less than pleased.

I shot exactly 50 thru it today, I figure it will come into itself pretty quick. Probably just in time for West Virginia opening day. I'll still take the 6.8 along so it doesn't get an attitude.

 

[wbw2123]

Looks sweet and a nice first day at the range. I had myself convinced you were doing a 270-223 Ingram build.

 

[BUFF7MM]

Looks sweet and a nice first day at the range. I had myself convinced you were doing a 270-223 Ingram build.

I figured it would be a good way to do a thread, seems to have been a good starter for a lot of searching and info hunting. I'm actually very excited to look at the numbers from 4570's lab radar too when we get to run it.

 

[CombatAK]

Hooligan helped handloads

Thanks to the Hooligans and their shenanigans, this is the result.

 

[Snav]

I talked to Sierra after ordering my 25-45 about their #1610 which is designated as varminter but at 2900fps it should be great match. They even sent me some loads based on 6mm-45 for starting data. The one thing I give up is tweaking l would do with Bolt gun as I don't know how port pressures change and there's no room in Mag to seat at lands. My kit won't arrive for another two weeks!

 

[Snav]

Ok so I'll put it out there

Gratz!!

 

[BUFF7MM]

I talked to Sierra after ordering my 25-45 about their #1610 which is designated as varminter but at 2900fps it should be great match. They even sent me some loads based on 6mm-45 for starting data. The one thing I give up is tweaking l would do with Bolt gun as I don't know how port pressures change and there's no room in Mag to seat at lands. My kit won't arrive for another two weeks!

My tweaking will happen with powder charges, I tried to seat a bullet to check jump an there no possible way to get it into an AR15 magazine. Chrono results should be along after tomorrow for some .1 grain separated loads I made up from data from my best group last go around.

 

[DadOSix]

nice firearm there Buff!

 

[BUFF7MM]

So I added a Midwest Industries double chamber brake and my groups opened up just a tad but I wasn't suprised, last shoot my best groups were 26.8 and 27.1 grains of H335, this time I got my best groups at 26.9 and 27.0 the muzzle energy from my testing were 1253-1306 foot pounds, velocities were 2547-2600 from the test loads mentioned above and the 16" barrel so I'd say it's good to go for Maryland's hunting regulations. Target was 100 yards. .1 increment between loads 26.9-27.3
I'm not done with it yet as Hornady has seen fit to discontinue the bullet I was testing with so its on to Sierra and Speer for the next round of loads.
Below is a picture of the 26.9 grain group, not the best by far but I'm not going to kick it out of bed for eating crackers just yet.

 

[Mike3888]

Thanks for posting your findings Buff. I've tried a lot of 335 with 85 grain Sierra in 6x45, groups were ok but not great. Same in the 6.8. Tried some 322 and the groups closed right up. The 335 worked great with lighter bullets. That 25 be great deer medicine no dought.
Enjoy.

 

[BUFF7MM]

Thanks for posting your findings Buff. I've tried a lot of 335 with 85 grain Sierra in 6x45, groups were ok but not great. Same in the 6.8. Tried some 322 and the groups closed right up. The 335 worked great with lighter bullets. That 25 be great deer medicine no dought.
Enjoy.

I'm thinking of dropping to 75 grain pills with the 335 to see where that ends up.
The designer said he really likes Ramshot x-terminator with the 87 grain pills, I might look that way also.