Throating for 300’s

jasent

ELR junkie
Belligerents
Jan 23, 2013
124
81
34
39
deer park wa
Last night the .338 throat reamer showed up. I had a little time so I pulled my barrel on the 338/375 XL and set up the ptg uni-throater about .025” short of my goal depth. Very surprising how fast it cuts! And yorke’s bushing fit my barrel very snug. Once I cut that I checked with dummy round and started doing .005” jumps which it cut in about 1 revolution. I may go anther .030-.050” but haven’t decided yet. Boat tail/ bearing junction is right at the bottom of the neck.

Before doing this I could shoot the 300gr EH @2650 before preasure signs
Today I did a quick preasure test and got preasure at 2800 and stiff bolt lift at 2830
Looks like my node will be 2750ish

More to comeF34F0FE0-8DC4-4376-AAAD-B0AA7C2AAFD9.jpeg
 

Lynn Jr

Private
Banned !
Belligerents
Nov 20, 2011
644
202
49
56
All my 338 Lapua and 338 Lapua Ackley improved reamers need 0.175-0.190 more freebore to properly seat a 300 grain bullet and get the most velocity.
 
  • Like
Reactions: jasent