Throating for 300’s

[jasent]

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 come

 

[b2lee]

What is you COAL now?

 

[jasent]

What is you COAL now?

3.990” at .015” off. Bto is 3.050
Yes I am single feeding it

 

[Lynn Jr]

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.

 

[jasent]

Got my load figured out. .005” off and 82gr of h1000 @2715 fps. Es of 11

 

[Geno C.]

How does that charge compare to your previous one?

 

[jasent]

How does that charge compare to your previous one?

The 2650 load was with 77 gr h1000 so it was 5gr less with more preasure

 

[jasent]

Did well at a mile today

 

[jasent]

Same load but with ff 8x68s Norma brass