Need loads for 7 TCU

[hylander]

10" Contender.
Looking for loads with 145 cast.
Have 4198 and 4227, 8208XBR, Tac.
Unique, 2400, #2, 5, 9
Mild to medium

[BMW Rider]

Check out this thread

https://castboolits.gunloads.com/sho...3-7mm-TCU-Cast

[hylander]

Check out this thread

https://castboolits.gunloads.com/sho...3-7mm-TCU-Cast

Thanks,
Lots of info on his process but nothing I'm really looking for.

[MT Gianni]

I have a 12" barrel. Someone tried to grind on it and I cut it back. I have had great luck with that bullet and IMR4895. I like it so well I have not tried other combos.

[BMW Rider]

Thanks,
Lots of info on his process but nothing I'm really looking for.

I was thinking the published load data in posts 7 and 67 for the 135 cast with 4198 and 4227 might get you close to where you want to be? But hopefully folks will post their favorites because I have a NOE 288-135-FN PB on the way for my 10” 7 mm TCU barrel.

[stubshaft]

When I shot Sillywett I tried 4227 (15.2 grs.) behind the RCBS 145 and it shot fine, but I preferred 322 and 335 because they metered better.

[1980Harley]

In my contender, a 14" barrel, a mild load of 16 grains gave the best accuracy. It was 0.332" average for a three shot group. Opened up to 1.9" for five shots. Average velocity was 1,400 fps. A very mild load.

[hylander]

In my contender, a 14" barrel, a mild load of 16 grains gave the best accuracy. It was 0.332" average for a three shot group. Opened up to 1.9" for five shots. Average velocity was 1,400 fps. A very mild load.

What powder

[1980Harley]

Imr 4198

[P Flados]

My IHMSA load ended up being a Lee 128 gr, PC, with aluminum gas checks I make. Charge is 27.3 of Wc 844 (milsurp for H335), COAL is 2.412".

I was going to run you a quickload table, but I could not find any info to guess at for boolit length and COAL.

[P Flados]

I was thinking the published load data in posts 7 and 67 for the 135 cast with 4198 and 4227 might get you close to where you want to be? But hopefully folks will post their favorites because I have a NOE 288-135-FN PB on the way for my 10” 7 mm TCU barrel.

Post COAL and your powders. I have NOE info with bullet length as 0.840".

[quilbilly]

8.5 gr of Unique is one of my favorite loads with 135 gr and 140 gr. boolits giving an mv of about 1350 out of the 10" barrel but I use 4198 in my 18" t/c carbine as a hunting load.

[hylander]

Well,
Waiting for my gas checks from Sages to get here. Then I'll try some Lee 130 and RCBS 145
On top of about 15.0 of 4227 or 16.0 of 4198 I'm thinking.
Thoughts?