Ed,
I'm using the 125gr BT in two different chamberings; a 10" Contender barrel in 30 Herrett and with a reduced charge of H4895 for a MV of ~2,500fps out of an 03A3. I've been very happy with the accuracy and performance of this bullet. Keeping the velocity within a reasonable range is the key to solid terminal performance.
If you're getting 2,300fps MV from your 30 Bellm using the 125gr BT, sighting in 3.2" high at 100 should put you 5.2" low at 250. That would give you a mid-point rise of 3.25" at 110 yards and is about the maximum I would consider using for that cartridge/bullet combo. If you'd like me to email you a drop sheet that you can print out, please send me a PM and I'd be glad to do that.
Interesting story on canola: When it was first being developed as a commercial food product crop, it was found to have high levels of selenium uptake, where this mineral was prevalent in the soil. In fact, it was deemed unsafe as a deer food plot seed because of the potential for elevated selenium levels in the deer, causing lower fawn birth weights, among other issues. Fortunately, the scientists who developed the strain of canola now propagated for both seed oil production and as a food plot product were able to manipulate the seed stock, selecting for plants with a lower propensity for selenium uptake. Ultimately, they arrived at the perfectly safe product we have today, which happens to be a core component of just about every brassica blend seed mix on the market.
Also, the plant is noted for elevated uptake of several other trace minerals which can often be deficient in the diet of whitetailed deer, making it something they love to eat that is also quite good for them. It's like getting your kids to LOVE broccoli!
Earlier versions of the seed are actually still used, intentionally planted where selenium levels in ground water are high.