88 TMK Loading Thread

[mtnbound]

Copycat haha. I think we found the perfect 223/88 TMK load.

I admit it, I copied you and yes Lever/88TMK is a great combination. I do want to test it during the summer and see how it does with warmer weather.

 

[43.6N]

You’re a 7twist though, you are likley good at all DA’s

7.5 twist here.
Same velocity.
2000ft da on day of testing.
I took it out to 1120yds.
G7 bc held up.

 

[KyleR1985]

I admit it, I copied you and yes Lever/88TMK is a great combination. I do want to test it during the summer and see how it does with warmer weather.

I think you’ll be just fine with 25gr and that COAL, depending on brass capacity.

I was happy with 26-26.5gr in LC brass.

 

[KY_coop]

If i can get these speeds in my 16" 22 arc ill be one happy fella. Just need a stock to come in!!

 

[mtnbound]

Awesome work. Sorry if I missed it, but what DA are you all, and have you tested this at distance?

DA today was 2000. I could only see the 550y target today due to clouds so that’s as far as I shot with the 88/Lever load and it was on at that distance but I need to do some more testing.

 

[mtnbound]

I think you’ll be just fine with 25gr and that COAL, depending on brass capacity.

I was happy with 26-26.5gr in LC brass.

Thanks for the info.

 

[mtnbound]

No kidding. Two good marksman as well, no doubt.

I need to read this entire thread more carefully to look for other loads.

Any recommendations for a powder for a .22-250 with the 88’s? I have a bunch of the traditional H380 from my old 1:12” twist rifle.

Edit - I just ordered some Leverevolution and more H4831sc. Along with some more CCI primers. It's going to be a long, fun summer.

My 22CM and N555 worked the best out of everything I tested.

 

[KyleR1985]

16.5” 223ai howa mini

223ai 3x Formed LC, 88tmk, 27gr lever, cci450, 2.5” oal, .100” off lands:

3 shots averaged 2815fps.



100 yards

 

[NWBLKTAIL]

Well I loaded 5 rounds each of Varget
23.5gr (2640) per Garmin
24gr avg (2700) per Garmin
1x Starline
CCI 450’s
About .015-.020 off touch.

I was shooting at 485ft, but my DA with variables Input through NOAA was -800



No pressure signs at either charge.


Left is 23.5 varget
Right is 24gr.
1/2” dots for reference




Calculated DA via NOAA.

It’s a stormy day on the coast, southerly winds.

 

[FB Trout]

Well I loaded 5 rounds each of Varget
23.5gr (2640) per Garmin
24gr avg (2700) per Garmin
1x Starline
CCI 450’s
About .015-.020 off touch.

I was shooting at 485ft, but my DA with variables Input through NOAA was -800



No pressure signs at either charge.

View attachment 1052278
Left is 23.5 varget
Right is 24gr.
1/2” dots for reference


View attachment 1052280

Calculated DA via NOAA.

It’s a stormy day on the coast, southerly winds.

They appear to be stable at 100 yards with the 8 twist. That is very good info, thank you.

 

[NWBLKTAIL]

They appear to be stable at 100 yards with the 8 twist. That is very good info, thank you.

I’ll know the real story once I get a chance to stretch them out

 

[bigunit]

Just got back from the range after a quick ladder test with the 20" 22-250 ai. Excellent results with n555. Got up to 3160 before getting some pressure signs. Ill back it off to about 3100 where there was a very flat velocity node. Retumbo did ok but not as well for velocity or accuracy. Ill load up a bunch and continue testing. Only jumping about .010"