Each brand usually has something good and bad. Harris 6-9 S-BRM is the one most of us run on our longrange rifles and pistols. The swivel feature allows for slight changes since the ratty old benches we shoot off of aren't level. They are also tight front to rear for an easy feel for forward pressure. They are really tough but I have a broken one now but haven't called Harris yet. I may just try welding it back together. This was after 8 years of use on our longrange pistols and rifles and a lot of prone shooting at the local 1000 yard matches. Chris doesn't exert much forward pressure but I can't complain because it's been a great bipod and is still the best buy for the buck.
Caldwell's are pretty decent but noticeably loose front to back but can work if you can get your shoulder pressure the same each time. Usually you'll see or feel the gun move slightly at the shot with a cheaper bipod, especially when shooting really small distant targets and you're watching the bullet fly and seeing the hits/misses.
I've got a couple Sinclair tactical bi-pods which are very stable side to side, have a very easy to adjust legs but also suffer from being loose front to rear which is mainly in the top attachment of each leg.
Joe Updike from Accurate Rifle Systems chassis makes a really nice F Class style center section that uses the Sinclair legs which is by far the best bipod for long-range I've tried.
Kinda pricey having to have a Sinclair then take it apart for the legs but does make a very stable support. I think Joe eventually wants to make the complete unit in house.
Some guns depending on weight, stock design and for some the shooters skill in getting behind the gun properly the same each time the gun will bounce or move slightly at each shot with a bipod. The rear rest is as important as the front and will cause a lot of verticle stringing if not set up the exact same each time. Some of our guns like rubber feet, some prefer round feet that let it slide slightly and others prefer spiked feet. Mixing them around on different guns you'll notice they perform differently, most like to have a mat of some type under them such as a bath mat. Experiment and find what suits you and your equipments needs and gets you better groups.
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