[Tightgroup 200gr Major Loads]

A Max load of tightgroup and a 200gr is listed at 822fps with a pressure of 31,700psi.

 

CFE power pistol with a 200gr gets you 897fps with a pressure of 33,500 psi.

 

SAAMI specs for 40sw are 35,000 psi.

 

Why is the max load for tightgroup so much under spec?

 

[Tightgroup 200gr Major Loads]

I do have a pound of N320 on the shelf, is that a better alternative for a 200gr major load?

[Tightgroup 200gr Major Loads]

44 minutes ago, cheers623 said:

What kind of 200gr projectile? That’ll make quite difference. If they’re some sort of moly-coat you’re probably fine. If they’re Montana Gold or other hard-assed jacketed bullet...it might be risky. YMMV

They are 200gr jacketed Berrys bullets. Double Struck FP

[Tightgroup 200gr Major Loads]

I’ve got a ton of 200gr projectiles and 8lbs of tightgroup so I’m trying to work up a load for major. So far 4.2gr of tightgroup with a 200gr at 1.185” gets me around 850fps out of my tanfolgio limited custom.

 

Since most manuals don’t have data for long loads, I started at 3.5gr and worked my way up. 
 

anyone have a similar load for this?

 

also, how do I tell if I’m at or above a max load? That’s my concern here