Some further updates for those like myself who like to chase .30-06 Serengeti chamber performance with today's modern powders and projectiles...
Unfortunately, German Salazar's .30-06 load data with his Serengeti reamer has drifted away when his 'The Rifleman's Journal' blog site went down some 10-12 years ago:
Some lucky ones were able to save his blog site info but did not want to re-post out of respect to German Salazar who kept certain things to his blog site. In contrast, the public articles German wrote, as a contributing editor, are still seen today on various well-known forum sites (see below), and this one here posted by BearCat74 on this site back in 2019 which outlines the 3 part series German wrote on .30-06 accuracy secrets (see PDF attachment below for more details):
I did some load development today out of my Winchester P17, made October of 1918. The rifle is in immaculate condition, with a pristine bore. The load was as follows... 168 Gr. Nosler Match HPBT Hornady Brass CCI LR IMR4895 Seated .025 off the lands I eventually settled on a load of 47.1gr...
www.marlinowners.com
Found a good amount of dedicated research by German Salazar using his .30-06 Serengeti reamer/chamber with load data here:
6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma...
www.6mmbr.com
DIfferent angle on his .30-06 Eliseo tube gun research (lot of picture links down, it seems, due to his blog site no longer being active) found here:
German answers some .30-06 posts here (his nick is GermanS1) and comments on his favorite .30-06 load (53.5gr H4350 and a moly 190gr SMK in a Serengeti chamber):
Another poster, Don/USSR, has additional relevant 1000 yard .30-06 190gr load data (although not sure what chamber used, SAAMI?):
Looking for input based on EXPERIANCE for a good 1000yd load preferably with 190 SMK's or 220 SMK's. My rifle is a Rem 700 that i true'd the action up and put a 1.25 shilen barrel on, Match spec chamber was cut by me, has a HS precision stock, so the rifle is set up right. Just looking for a...
www.thehighroad.org
On that note, recent conversations with Frank Green of Bartlein Barrels (real nice guy who takes time to explain things to randoms who call) related the Serengeti reamer/chamber is really only best for 190-200 grain class projectiles. That is, hunters will really get no benefit from this reamer using factory loads. German Salazar related as much in his articles saying even 200 grain class pills would ideally most likely need 0.070" more freebore over the 190 smks using current Serengeti chamber dimensions. In other words, 90% of most .30-06 users will never see the benefit of the Serengeti chamber unless using 190gr class projectiles that are seated far out enough from the powder column to either necessitate single loading or the use of 4"+ DBM options from the likes of Wyatt Magazines:
30-06 Assembly w/ 5 round mag
wyattsoutdoor.com
Interestingly, using factory Lapua 123gr .30-06 ammunition was surprisingly accurate for banging 12" steel plates with cold bore shots out to 600 yards using Kestrel data. A bedded 10-twist 26" Bartlein Serengeti chamber did not seem to hamper performance given the amount of jump these tiny pills did with speeds hovering around 2950-3050 (went up as morning went to noon at an altitude of 1100 and 75F-->81F as the day went on). Still need to load 190 smks Salazar-style and try longer ranges to see what kind of accuracy I can get out of a non-tube mag fed rig...
Anyone with Rifleman Journal Blog info, on this topic, they are willing to share would be appreciated.