Sierra 88 TMK Load Data

[Scooby-93]

Book max of n565 22 creed. 16".

Ha, first two shots with this rifle I haven't shot in a while didn't go good

Going to increase my neck tension and try it again. This gun keeps doing the double cluster in a single group. Measured my case mouths with a loaded round. Was at .251. lol my bushing is .250
15 shots total.

What charge of n565? I run n565 45.6gr 88eld and it shoots lights out.

Check your action/base screws and make sure your barrel isn’t touching barrel with split groups.

Please update

 

[Scooby-93]

@SloppyJ . Did you happen to measure case head expansion at .200 line after first firing on the new brass? Thinking I'm going to give the Alpha brass a try this summer

+1 @SloppyJ have you measurements before and after?

 

[TradLife406]

I can’t speak for anyone else. But on my rig, the 0.263 g7 bc has held up out to 1120yds.
View attachment 1071267
I’ve also figured out a solution for 5 round 223 aics mags that I’m happy with. But that’s for another post lol.

18” 223
23.0gr 8208xbr
2690fps
Swfa 3-9
Rokstok

What bdm are you using for aics?

Butchered a brand new rokstok standard this weekend to get the Red Snake to hopefully work. But the front oem action screw is too short now

My original plan was to convert a CTR rokstok to aics with my Atlas bdm. But apparently when UM says 120 day lead time that's give or take a month or two So to try and get my trainer in a Rokstok for S2HU next week I bought a Rok from a buddy.

Only complaint with the tikka are the mags. Had my 6 UM mag just come apart the other day randomly

 

[43.6N]

What bdm are you using for aics?

Butchered a brand new rokstok standard this weekend to get the Red Snake to hopefully work. But the front oem action screw is too short now

My original plan was to convert a CTR rokstok to aics with my Atlas bdm. But apparently when UM says 120 day lead time that's give or take a month or two So to try and get my trainer in a Rokstok for S2HU next week I bought a Rok from a buddy.

Only complaint with the tikka are the mags. Had my 6 UM mag just come apart the other day randomly

Dm sent

 

[SloppyJ]

+1 @SloppyJ have you measurements before and after?

I can measure later after our baseball game if I can remember. I doubt it was anything excessive. Why are you concerned with that measurement? I've only heard it really honed in on for PRC cases.

 

[Scooby-93]

I can measure later after our baseball game if I can remember. I doubt it was anything excessive. Why are you concerned with that measurement? I've only heard it really honed in on for PRC cases.

More out of interest really, I am shooting alpha out of my current creed barrel. No issues other than had to run a really mild load on first firing as would get case head swipe with anything more.
Fixed its self after first firing.

 

[SloppyJ]

More out of interest really, I am shooting alpha out of my current creed barrel. No issues other than had to run a really mild load on first firing as would get case head swipe with anything more.
Fixed its self after first firing.

They grew 2 thou almost exactly over 4 or 5 different pieces.

 

[Rugger7622]

I shot 88 TMKs in in my 16.5 PVA 22 Creedmoor last week and they were lights out at 100 yards. Can't take them longer distances for a while due to work.

Alpha Brass
COAL = 2.695, loaded about .015 off my lands
CC450 SRP
39 grains of H4350
2,995 fps

No indications of pressure, this is the same load I shot with 88 ELDM's