I'd like to see more info on the 33 and 37XC. Unfortunately Tubbs has the info on facebook which means no access for me. I'm curious whether or not it would be a good fit for the SRS.....
Frank
The case is too long to fit in our magazines so it will be a single shot. If that matters to you.
You probably don't need a Facebook login to view it. Click here:
https://www.facebook.com/6238858610...david-tubb-superior-shootin/1635492476559977/
If that doesn't work, I pasted it below.
Vestals Custom Rifles
August 7 ·
Introducing the new 33XC & 37XC cartridges designed by David Tubb - Superior Shooting Systems LLC!! Brass will be made by
Peterson Cartridge Co which is among some of the best made today!! Here is the results:
Initial testing
33XC - 34 inch barrel. Warner 256 Flatline.
113 gr Retumbo 3375 FPS
118 gr Reloader 33 3400 FPS
37 XC 33 inch barrel. warner 364 Flatline
120 gr H1000. 3125 FPS
121 gr RETUMBO 3118
These charges will allow multiple reloadings with full use of the neck for bullet stability.
I loaded a single 37XC case over 20 times breaking in the Schneider 375 barrel.
Shot loads in that particular case that were to hot and the primer pocket became loose but never failed.
33xc brass is $2.21 per piece. Brass arrives end of August.
The 33XC (eXtra Capacity) has up to 130gr of useable powder capacity while leaving the .393” neck unfilled. Based off of a .580” bolt head, it extracts with ease when using a properly polished chamber & maximum powder charge. The 33XC has a 35-degree shoulder (.350” more body length with less body taper & additional .065” longer neck when compared to 338 Lapua case). Total case OAL is 3.087”. It favors 50BMG or Reloader33 burn rate powders with either 250 or 300gr bullets. 300gr jacketed/lead core bullets yield over 3150 fps & 250 gr jacketed/lead core yield over 3450 fps. Monolithic 250gr achieve the same velocities with approx. 3 grains less powder. (Test barrel: 28” Schneider 5 P/9 twist).
In 37XC, H1000 & Retumbo burn rate powders work well. Warner Flatline 361gr bullets fly at 3075fps with just over 120gr of either powder. (Used 33” Schneider 5P/7 twist) barrel.
If anyone is interested in either the 33XC and/or the 37XC, we will have the reamers, reloading dies and brass so give us a call so we can start your build.
Pic is a 338 lapua (empty)- 33XC Warner 256gr Flatline – 33XC head – 37XC Warner 361gr Flatline – 375 Cheytac (empty)
Note - the XC case length VS. the 375 Cheytac