+P Throating Applications
+P Throating Applications
After fielding like a hundred questions about +P throating I decided to sit down and collect up all of our research and prior +P modified rounds. In short the +P modification is a benefit if there is sufficient capacity left in the case at the current load. For example, if you have a round with your pet load that uses 97% of the usable case capacity with the bullet seated then there is enough room for the additional powder that the +P mod would require. Below I have listed most of the rounds we have modified with the +P throat and the results. There are very few rounds / load combinations that the +P mod doesn’t show some benefit. Most rounds using the same powder and allowing that there is enough capacity like we have already talked about will see 100-150 fps increase in velocity. Here is the data I collected so far here at the shop.
243 Win
Barrel: 26” Hart 1-8
Bullet: 108 gr Hornady ELD-M
Powder: RL 26
Standard Chamber: 3102 fps / 47.0 gr.
+P Chamber: 3227 fps / 50.5 gr.
Notes: Needed to use drop tube to get consistent bullet seating
260 Rem
Barrel: 26” Hart 1-8
Bullet: 140 Berger Hybrid Target
Powder: H4350
Standard Chamber: 2778 fps / 43.0gr.
+P Chamber: 2985 fps / 46.0 gr.
Notes:
6.5 Creedmoor
Barrel: 24” Hart 1-8
Bullet: 142 SMK
Powder: H4350
Standard Chamber: 2771 fps / 43.0 gr.
+P Chamber: 2941 fps / 47.0 gr.
6.5-284
Barrel: 26” Hart 1-8
Bullet: 140 Berger Hybrid Target
Powder: RL 26
Standard Chamber: 3065 fps / 55.5 gr.
+P Chamber: 3192 fps / 58.5 gr.
Notes: Needed to use drop tube to get consistent bullet seating
7 WSM
Barrel: 26” Hart 1-8
Bullet: 180 gr. Berger VLD Hunting
Powder: H4831SC
Standard Chamber: 2843 fps 63.0 gr.
+P Chamber: 3020 fps / 68.0 gr.
7 Rem Mag
Barrel: 26” Hart 1-8
Bullet: 180 gr Hornady ELD-M
Powder: RL 26
Standard Chamber: 2960 fps / 68.0 gr.
+P Chamber: 3104 fps / 72.0 gr.
300 PRC
Barrel: 26” Hart 1-9
Bullet: 215 Berger Hybrid Target
Powder: H1000
Standard Chamber: 2996 fps / 80.0 gr.
+P Chamber: 3106 fps / 84.5 gr.
300 Norma
Barrel: 26” Hart 1-9
Bullet: 230 Berger Hybrid Target
Powder: H 1000
Standard Chamber: 2849 fps. / 84.0 gr.
+P Chamber: 2982 fps / 87.5 gr.
300 RUM
Barrel: 26” Hart 1-9
Bullet: 230 Berger Hybrid Target
Powder: H 1000
Standard Chamber: 2912 fps / 89.0 gr.
+P Chamber: 3058 fps / 92.5 gr.
338 Lapua
Barrel: 30” Hart 1-9
Bullet: 300 gr SMK
Powder: H1000
Standard Chamber: 2762 fps / 88.0 gr.
+P Chamber: 2874 fps / 92.5 gr.
338 Edge
Barrel: 30” Hart 1-9
Bullet: 300 gr Berger Elite Hunter
Powder: H 1000
Standard Chamber: 2808 fps / 90.0 gr.
+P Chamber: 2937 fps / 95.0 gr.
A side note here during this testing is that the heavier and longer bullets show more benefit than shorter lighter bullets. There is still benefit in the +P throat for the lighter bullets, but not as high of a percentage of increase in velocity. Hope this info helps to answer some questions and clear the air about +P modified throats.
