Not sure how long the barrel is going to last, but +5000 FPS is "ludicrous speed" for sure.
http://bulletin.accurateshooter.com/2012/07/5000-fps-with-22br-improved-and-30gr-berger-bullets/
<span style="font-style: italic"><span style="font-weight: bold">5000+ FPS with 22BR Improved and 30gr Berger Bullets</span></span>
Forum member XmarksSpot has been shooting a wicked fast varmint cartridge that has broken the 5000-fps barrier using Berger 30gr varmint bullets. That’s some serious velocity! The parent case is a 6mmBR, which is then improved and necked down to .224 caliber.
XmarksSpot reports:
Some people think 5000+ fps is mythical. Well just thought I’d let you guys know that I got 5239 fps a couple weeks ago shooting 30-grainers with my 224 McDonald, a wildcat cartridge based on an improved 6BR case necked down to 224. (This case is very similar to a 22 Dasher.) The bullet used is the 30gr Berger. (The 40s run fast too — about 4800 fps.) The rig is a Rem 700 with a 30″ Hart barrel. Below is the case before and after forming. As you can see it has a 40° shoulder and far more case capacity than a 22 BR (a 22 Dasher case holds about 41.0 grains H20). My most accurate loads are with 50-52gr bullets, with bugholes the norm at 4200 fps. The 40gr bullets will do 4800+ fps.
This 224 McDonald wildcat was originally developed by Charles McDonald. He has been developing and chambering custom cartridges for years. Editor’s Note: Many folks may not be aware of the little .224-caliber 30gr Berger varmint bullet, and some online vendors don’t carry it. It is Berger stock # 22301 . It has an 0.119 G1 BC and will work in 1:15″ or faster twist barrels. You’ll find more info on BergerBullets.com in the “Products: Varmint Bullets” section.
http://bulletin.accurateshooter.com/2012/07/5000-fps-with-22br-improved-and-30gr-berger-bullets/
<span style="font-style: italic"><span style="font-weight: bold">5000+ FPS with 22BR Improved and 30gr Berger Bullets</span></span>
Forum member XmarksSpot has been shooting a wicked fast varmint cartridge that has broken the 5000-fps barrier using Berger 30gr varmint bullets. That’s some serious velocity! The parent case is a 6mmBR, which is then improved and necked down to .224 caliber.
XmarksSpot reports:
Some people think 5000+ fps is mythical. Well just thought I’d let you guys know that I got 5239 fps a couple weeks ago shooting 30-grainers with my 224 McDonald, a wildcat cartridge based on an improved 6BR case necked down to 224. (This case is very similar to a 22 Dasher.) The bullet used is the 30gr Berger. (The 40s run fast too — about 4800 fps.) The rig is a Rem 700 with a 30″ Hart barrel. Below is the case before and after forming. As you can see it has a 40° shoulder and far more case capacity than a 22 BR (a 22 Dasher case holds about 41.0 grains H20). My most accurate loads are with 50-52gr bullets, with bugholes the norm at 4200 fps. The 40gr bullets will do 4800+ fps.
This 224 McDonald wildcat was originally developed by Charles McDonald. He has been developing and chambering custom cartridges for years. Editor’s Note: Many folks may not be aware of the little .224-caliber 30gr Berger varmint bullet, and some online vendors don’t carry it. It is Berger stock # 22301 . It has an 0.119 G1 BC and will work in 1:15″ or faster twist barrels. You’ll find more info on BergerBullets.com in the “Products: Varmint Bullets” section.