Recent content by brittf

On-topic question :) I am up for the 7mm Mega over the 7mm Max. I am not a huge Hornady die fan, although they will probably do in the interim. Any timeframe on the Micron resizing and seater dies?

Apologies are in order... I was politely told via a PM that some of my posts were a bit off-topic and maybe it would be better to start a different thread. I can understand this and will attempt to do so. Any further posts by me in this forum/thread will be directly related to the Sherman...

Thanks :) It is interesting for me to reflect upon my personality and my response to the earlier questions about FB etc... One thing I despise on forums is when someone posts opinions and digs in their heels and acts like an expert when they are clearly not. I was a bit afraid that I looked...

Also, Berger is better than most at giving some of their bullet dimension details, but drawing the ogive is fairly challenging. The other bullet manufacturers don't publish much information. I have Bryan Litz's 'Ballistic Performance of Rifle Bullets' 3rd Edition, and he gives detailed...

If you didn't want to download, here is a picture of the file:

Thank you for the reply. I appreciate the information and taking the time to respond. I tend to be overly analytical on engineering design questions. So, I generally draw everything out in excruciating detail and avoid rules-of-thumb. It probably annoys the people around me, but my students...

One other comment that illustrates the potential confusion around chambers is the complete lack of consistency about terms. I defined my terms in an earlier post but noted that there is no real standardization. What we are calling FB (Freebore) in the prior three posts is often called by other...

You are the designer, so of course you know it best. I am very appreciative of your efforts to develop these cartridges and how responsive you are to people like me via phone and email. However, in my defense, I was not asking these questions in the forum casually based on hearsay information...

True, but at some point you just have to decide based on what you have on-hand/access to and then shoot out the barrel :) The beauty of the separate 'Lead and Throating' reamer is that you are not locked in for all future chambers. If a cool new bullet comes out, then you can increase the FB in...

Yes, actually called to verify. The 28 Sherman Magnum is about 0.260" FB (using 0.225" Lead) which is pretty spot-on for the 180-197 gr bullets, although I would agree that 0.285" might be even better for the very long bullets. It is always a tradeoff - if you want to handle the very...

Thank you both for your replies. I suspect that close to 'touch' (let's say jump < 0.020") is probably best for accuracy nodes. My drawings suggest that an extra 0.100" might be a tad too much additional Freebore (it takes total Freebore from 0.205" to 0.305"). As 'highdrum' states, his...

So, I have been doing some detailed drawings with Sherman chambers and various bullets to better understand jump and bullet selection. I understand no one has the Mega brass yet, since it isn't available, but I would appreciate some information on jump for those of you who have the Sherman Max...

Welcome to the neighborhood. Be sure to ping me when you get to the Austin area. I can show you around. I will also have two Sherman 'sets' by then - if you have the Mega, then I will probably go with the 7mm Max and the 28 Sherman Magnum. I have a full shop and happy to have you use it to...

A different question here. I seem to be on the forum a lot today. I don't typically run compensators/muzzle breaks for cartridges up to 30-06. However, there seems to be considerable use of them in the magnum (and magnum-like) cartridges on this forum. I would tend to NOT run a...

Lots of details follow, so some may want to skip the post. However, IF you are interested in understanding M5 DBM magazines that properly feed the SAUM based Sherman cartridges (SST, SS, Max) and the WSM based Sherman cartridges (Mega), the post may be of interest. I was afraid that might be...